Kasitomala adaitanitsa ma valve achitsulo okhala ndi zipata. Pa nthawi yolankhulana, tinaona kuti ma valve amenewa ayenera kugwiritsidwa ntchito m'madzi oyera. Malinga ndi zomwe takumana nazo, ma valve a zipata okhala ndi zipata ndi ochuluka.
Nthawi yotumizira: Juni-14-2016